<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>登录页面</title>
    <link rel="stylesheet" href="css/common.css">
    <link rel="stylesheet" href="css/login.css">
</head>
<body>
    <div class="nav">
        网页聊天
    </div>
    <div class="login-container">
        <div class="login-dialog">
            <h3>登录</h3>
            <div class="row">
                <span>用户名</span>
                <input type="text" id="username">
            </div>
            <div class="row">
                <span>密码</span>
                <input type="password" id="password">
            </div>
            <div class="row">
                <button id="submit">登录</button>
            </div>
        </div>
    </div>
    <script src="http://code.jquery.com/jquery-2.1.1.min.js"></script>
    <!-- 实现前后端交互 -->
     <script>
        // 定义一个点击时间
        let submitButton=document.querySelector("#submit");
        submitButton.onclick=function(){
            //获取输入的内容
        let username=document.querySelector("#username").value;
        let password=document.querySelector("#password").value;
        if(username == "" || password == ""){
            alert("当前输入的用户名或者密码为空");
            return;
        }
        $.ajax({
            method:"post",
            url:"/login",
            data:{
                username:username,
                password:password
            },
            success:function(body){
                if(body && body.userId>0){
                    alert("登录成功");
                    location.assign("/client.html");
                }else{
                    alert("登录失败");
                }
            }
        });
    }
     </script>
</body>
</html>